Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b417a648e5eb35…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 20:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa4a55d8c4e66843ca6bf50b548d0b8e SHA-1: fb7f8c82f7f3b7e340efd46bae858fdffc48b1f6 SHA-256: 18b417a648e5eb35abc3603f46a7a15f1176d5c340625992786c5d7191f9f01d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=m532+android+update PDF link annotation
    • https://muratay.nl/userfiles/file/19961682201.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/guwagarumukasoripunabu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4ccik9cnq007drac3ijvtutfoi/43181887955.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/19831023067.pdfIn PDF document text
    • http://dakov.hu/_user/file/tifevudizujiwetinifiropax.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tidopalufalodelefed.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/76389415343.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/fanisolelekerala.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4efe35ae69a5a401abd868ec2f6a8590/85731780197.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/15243346761.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/46985721155.pdfIn PDF document text
    • http://patroha.hu/file/48551538016.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/75177561451.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/472gto5o2na5j6mr9kea4akmel/80612231104.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/71826279883.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/47473023374.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613190377b96e---89238766027.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/37806173580.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e37e8df85---bumiwukiradofetaneki.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/munabefasase.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/45591984076.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nukamebumopaderosevebipa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb85d65f3---pubanobamezujuvorugataza.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/94f280045c4be86d11919f7fb6cfdca0/42464454815.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea09f319d---lafafekekefokewadugibelo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 18636 bytes
SHA-256: d61a753e1408c6368fcd37afce0be727665c8a5bdc8299b4796e659c5e6bdfbc
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 10692 bytes
SHA-256: e11acdeef43bcb525c02962d67f920484022dcb795b7fe4b8429242b98e5685f

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